Mold for duplicate phonograph-records.



PATENTBD MAR. 21, 1905 lnv enfonr a? I Attorneys W H. MILLER & A. N.HERMAN. MOLD FOR DUPLICATE PHONOGRAPH RECORDS.

APPLICATION FILED FEB. 26. 1903.

Witnesses:

IINHED STATES Patented March 21, 1905.

PATENT OFFICE.

WALTER H. MILLER, OF ORANGE, AND ALEXANDER N. PIERMAN, OF NEWARK, NEWJERSEY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO NEW JERSEY PATENT COMPANY,OF WEST ORANGE, NEWV JERSEY, A CORPORATION OF NEW JERSEY.

MOLD FOR DUPLICATE PHONOGHAPH-REOORDS.

SPECIFICATION forming part of Letters Patent No. 785,510, dated. March21, 1905 A li ati fil d February 26, 1903. Serial No. 1 15,189-

To all whom 2125 may concern:

Be it known that we, WALTER H. MILLER, residing at Orange, and ALEXANDERN. PIER- MAN, residing at Newark, in the county of Essex and State ofNew Jersey, both citizens of the United States, have invented a certainnew and useful Improvement in Molds for Duplicate Phonograph-Records,ofwhich the following is a description.

Our invention relates to an improved mold for making duplicatephonograph-records, preferably of the type described in Letters PatentNo. 726,966, dated May 5, 1903, wherein the wax or wax-like material isintimately associated with a fibrous material throughout its mass. Themold may, however, be employed for producing duplicate phonographr cordscomposed of a wax or wax-like material throughout or for the manufactureof blanks. In Letters Patent No. 726,965, dated May 5, 1903, we describean improved process for making duplicate phonograph-records in which amold is used having a core concentrically arranged therein, the wax orwaxlike material in molten condition being intro duced upwardly into thespace between the mold and core. Some diificulty has been experienced inpractice with this apparatus, as sometimes the mold is accidentallyshifted radially with respect to the core, so that the bore of theresulting duplicate is somewhat eccentric with respect to therecord-surface.

The essential object of the present invention, therefore, is to providea mold in which the core will during the setting or cooling of thematerial be maintained exactly concentric to the mold, so as to therebyovercome the objection pointed out.

To this end the invention consists in providing the core with aninclined shoulder which is engaged by the bottom edge of the mold and inutilizing a separate heading-disk for engaging the core and providedwith an inclined shoulder which engages the upper end of the mold,whereby the mold will autoa smooth bore.

matically be centered with respect to the core during the cooling of thematerial.

In order that the invention may be better understood, attention isdirected to the accompanying drawing, forming a part of thisspecification, and in which we illustrate a sectional view of thepreferred manner of carrying our invention into effect.

The core 1 is hollow and is preferably formed with a spiralgroove 2, soas to permit it to be readily removed from the finished duplicate, aswell as to form a spiral rib on the latter for engagement with themandrel of the phonograph. The core is formed with a base 3, having aninclined shoulder 4:, with which the inner bottom edge of the mold 5engages. This mold is made in any suitable way and carries a negativerepresentation of the record on its bore. If the apparatus is to be usedfor molding blanks, the mold is provided with A series of headed pins 6are mounted in the base 3, as we describe in our said Patent No.726,965, for supporting the mold, the arrangement being such thatwhenthe parts are assembled and introduced into a tank containinga moltenwax-like material the pins will elevate the mold to permit the wax-likematerial to enter the space between the mold and core. The upper portion7 of the core is made cylindrical and receives a heading-disk 8, formedwith an inclined shoulder 9, which engages the inner edge of the upperend of the mold, as shown. This heading-disk may be provided with one ormore vents 10 to permit of the escape of air from the space between themold and core.

In operation the mold is first inserted over the core and theheading-disk 8 engaged with its upper end. The mold and core are nowintroduced into the molten material, and the pins 6 will elevate themold to permit the 1110i? ten material to enter the space between themold and core. 'If practically indestructible duplicates are to beproduced, as we describe in .our Patent No. 726,966, a mass of fibrousmaterial.

material, such as cotton-wool, is first loosely wound around the core,so that the molten wax-like material will thoroughly impregnate thesame. When the space between the mold and core has been filled to theproper height with the molten wax-like material, the parts are removedby a suitable bail applied to the core, thus permitting the mold todescend until the inner edge of its lower end engages the shoulder I, soas to prevent the escape of the The heading-disk 8 also descends and byits engagement with the upper end of the mold effectively centers thesame. As soon as the material has sufficiently cooled the heading-diskis removed, the core unscrewed from the resulting duplicate, and thelatter is then contracted by further cooling until it may be removedfrom the mold.

Having now described our invention, what we claim is 1. In apparatus ofthe character described, the combination with a cylindrical one-piecemetal mold, of a core within the same having a tapered shoulder uponwhich one edge of the mold rests, loosely engaging the same,substantially as set forth.

2. In apparatus of the character described, the combination with acylindrical one-piece metal mold, of a core within the same having atapered shoulder upon which the inner edge 7 of the mold rests, looselyengaging the same,

substantially as set forth.

3. In apparatus of the character described, the combination with acylindrical mold, of a core within the same having a tapered shoul- 1der with which one edge of the mold engages, and a heading-disk carriedby the core having an inclined shoulder for engaging an opposite edge ofthe mold, substantially as set forth.

I. In apparatus of the character described, the combination with acylindrical mold, of a core within the same having a tapered shoulderwith which one of the inner edges of the mold engages, and aheading-disk carried by the core having an inclined shoulder forengaging the opposite inner edge of the mold, substantially as setforth.

5. In apparatus of the character described, the combination with acylindrical mold, of a core having an inclined shoulder with which oneof the edges of the mold engages, and a series of pins for moving themold longitudinally with respect to the core, substantially as setforth.

6. In apparatus of the character described, the combination with acylindrical mold, of a core having an inclined shoulder with which oneof the edges of the mold engages, a series of pins for moving the moldlongitudinally with respect to the core, and a heading-disk carried bythe core having an inclined shoulder for engaging an opposite edge ofthe mold, substantially as set forth.

This specification signed and witnessed this 24th day of February, 1903.

l/VALTER H. MILLER. ALEXANDER N. PIERMAN. Witnesses:

J NO. Rom. TAYLOR, JOHN LOUIS LOTSCH.

